Sun Quan, Zu Shuai, Misawa Hiroaki
Research Institute for Electronic Science, Hokkaido University, Sapporo 001-0021, Japan.
J Chem Phys. 2020 Sep 28;153(12):120902. doi: 10.1063/5.0013659.
The near-field properties and dynamics of plasmonic nanostructures play a crucial role in several fundamental concepts in physics and chemistry, and they are widely relevant in plasmonic applications. Ultrafast photoemission electron microscopy (PEEM) is a novel approach that has been widely applied to probe plasmonic nanostructures from multiple domains. Furthermore, PEEM is the only technique that provides nanometer spatial resolution, sub-femtosecond temporal resolution, and tens to hundreds of millielectron volt energy resolution. This allows for extremely sensitive observations of plasmonic field oscillations, field dephasing, and hot electrons. This Perspective provides a brief overview of the basic principles and main applications of ultrafast PEEM. The research progress of ultrafast PEEM in plasmonics is highlighted from three points of view: near-field imaging, near-field spectroscopy, and ultrafast dynamics. Future applications of PEEM in plasmonics for the probing of plasmonic hot electron dynamics in the energy and time domains are proposed and discussed.
等离子体纳米结构的近场特性和动力学在物理和化学的几个基本概念中起着至关重要的作用，并且在等离子体应用中具有广泛的相关性。超快光发射电子显微镜（PEEM）是一种新型方法，已被广泛应用于从多个领域探测等离子体纳米结构。此外，PEEM是唯一一种提供纳米级空间分辨率、亚飞秒时间分辨率和数十至数百毫电子伏特能量分辨率的技术。这使得能够极其灵敏地观察等离子体场振荡、场退相和热电子。本综述简要概述了超快PEEM的基本原理和主要应用。从近场成像、近场光谱和超快动力学三个角度突出了超快PEEM在等离子体学中的研究进展。提出并讨论了PEEM在等离子体学中未来用于探测能量和时域中等离子体热电子动力学的应用。
